MacOSKeychainAPIChecker.cpp revision b805c8ff133ef0c62df032fa711d6b13c5afd7f4
1//==--- MacOSKeychainAPIChecker.cpp ------------------------------*- C++ -*-==// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// This checker flags misuses of KeyChainAPI. In particular, the password data 10// allocated/returned by SecKeychainItemCopyContent, 11// SecKeychainFindGenericPassword, SecKeychainFindInternetPassword functions has 12// to be freed using a call to SecKeychainItemFreeContent. 13//===----------------------------------------------------------------------===// 14 15#include "ClangSACheckers.h" 16#include "clang/StaticAnalyzer/Core/Checker.h" 17#include "clang/StaticAnalyzer/Core/CheckerManager.h" 18#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" 19#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 20#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h" 21#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h" 22 23using namespace clang; 24using namespace ento; 25 26namespace { 27class MacOSKeychainAPIChecker : public Checker<check::PreStmt<CallExpr>, 28 check::PreStmt<ReturnStmt>, 29 check::PostStmt<CallExpr>, 30 check::EndPath, 31 check::DeadSymbols> { 32 mutable llvm::OwningPtr<BugType> BT; 33 34public: 35 /// AllocationState is a part of the checker specific state together with the 36 /// MemRegion corresponding to the allocated data. 37 struct AllocationState { 38 /// The index of the allocator function. 39 unsigned int AllocatorIdx; 40 SymbolRef Region; 41 42 AllocationState(const Expr *E, unsigned int Idx, SymbolRef R) : 43 AllocatorIdx(Idx), 44 Region(R) {} 45 46 bool operator==(const AllocationState &X) const { 47 return (AllocatorIdx == X.AllocatorIdx && 48 Region == X.Region); 49 } 50 51 void Profile(llvm::FoldingSetNodeID &ID) const { 52 ID.AddInteger(AllocatorIdx); 53 ID.AddPointer(Region); 54 } 55 }; 56 57 void checkPreStmt(const CallExpr *S, CheckerContext &C) const; 58 void checkPreStmt(const ReturnStmt *S, CheckerContext &C) const; 59 void checkPostStmt(const CallExpr *S, CheckerContext &C) const; 60 void checkDeadSymbols(SymbolReaper &SR, CheckerContext &C) const; 61 void checkEndPath(CheckerContext &Ctx) const; 62 63private: 64 typedef std::pair<SymbolRef, const AllocationState*> AllocationPair; 65 typedef llvm::SmallVector<AllocationPair, 2> AllocationPairVec; 66 67 enum APIKind { 68 /// Denotes functions tracked by this checker. 69 ValidAPI = 0, 70 /// The functions commonly/mistakenly used in place of the given API. 71 ErrorAPI = 1, 72 /// The functions which may allocate the data. These are tracked to reduce 73 /// the false alarm rate. 74 PossibleAPI = 2 75 }; 76 /// Stores the information about the allocator and deallocator functions - 77 /// these are the functions the checker is tracking. 78 struct ADFunctionInfo { 79 const char* Name; 80 unsigned int Param; 81 unsigned int DeallocatorIdx; 82 APIKind Kind; 83 }; 84 static const unsigned InvalidIdx = 100000; 85 static const unsigned FunctionsToTrackSize = 8; 86 static const ADFunctionInfo FunctionsToTrack[FunctionsToTrackSize]; 87 /// The value, which represents no error return value for allocator functions. 88 static const unsigned NoErr = 0; 89 90 /// Given the function name, returns the index of the allocator/deallocator 91 /// function. 92 static unsigned getTrackedFunctionIndex(StringRef Name, bool IsAllocator); 93 94 inline void initBugType() const { 95 if (!BT) 96 BT.reset(new BugType("Improper use of SecKeychain API", "Mac OS API")); 97 } 98 99 void generateDeallocatorMismatchReport(const AllocationPair &AP, 100 const Expr *ArgExpr, 101 CheckerContext &C) const; 102 103 BugReport *generateAllocatedDataNotReleasedReport(const AllocationPair &AP, 104 ExplodedNode *N) const; 105 106 /// Check if RetSym evaluates to an error value in the current state. 107 bool definitelyReturnedError(SymbolRef RetSym, 108 const ProgramState *State, 109 SValBuilder &Builder, 110 bool noError = false) const; 111 112 /// Check if RetSym evaluates to a NoErr value in the current state. 113 bool definitelyDidnotReturnError(SymbolRef RetSym, 114 const ProgramState *State, 115 SValBuilder &Builder) const { 116 return definitelyReturnedError(RetSym, State, Builder, true); 117 } 118 119 /// The bug visitor which allows us to print extra diagnostics along the 120 /// BugReport path. For example, showing the allocation site of the leaked 121 /// region. 122 class SecKeychainBugVisitor : public BugReporterVisitor { 123 protected: 124 // The allocated region symbol tracked by the main analysis. 125 SymbolRef Sym; 126 127 public: 128 SecKeychainBugVisitor(SymbolRef S) : Sym(S) {} 129 virtual ~SecKeychainBugVisitor() {} 130 131 void Profile(llvm::FoldingSetNodeID &ID) const { 132 static int X = 0; 133 ID.AddPointer(&X); 134 ID.AddPointer(Sym); 135 } 136 137 PathDiagnosticPiece *VisitNode(const ExplodedNode *N, 138 const ExplodedNode *PrevN, 139 BugReporterContext &BRC, 140 BugReport &BR); 141 }; 142}; 143} 144 145/// ProgramState traits to store the currently allocated (and not yet freed) 146/// symbols. This is a map from the allocated content symbol to the 147/// corresponding AllocationState. 148typedef llvm::ImmutableMap<SymbolRef, 149 MacOSKeychainAPIChecker::AllocationState> AllocatedSetTy; 150 151namespace { struct AllocatedData {}; } 152namespace clang { namespace ento { 153template<> struct ProgramStateTrait<AllocatedData> 154 : public ProgramStatePartialTrait<AllocatedSetTy > { 155 static void *GDMIndex() { static int index = 0; return &index; } 156}; 157}} 158 159static bool isEnclosingFunctionParam(const Expr *E) { 160 E = E->IgnoreParenCasts(); 161 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 162 const ValueDecl *VD = DRE->getDecl(); 163 if (isa<ImplicitParamDecl>(VD) || isa<ParmVarDecl>(VD)) 164 return true; 165 } 166 return false; 167} 168 169const MacOSKeychainAPIChecker::ADFunctionInfo 170 MacOSKeychainAPIChecker::FunctionsToTrack[FunctionsToTrackSize] = { 171 {"SecKeychainItemCopyContent", 4, 3, ValidAPI}, // 0 172 {"SecKeychainFindGenericPassword", 6, 3, ValidAPI}, // 1 173 {"SecKeychainFindInternetPassword", 13, 3, ValidAPI}, // 2 174 {"SecKeychainItemFreeContent", 1, InvalidIdx, ValidAPI}, // 3 175 {"SecKeychainItemCopyAttributesAndData", 5, 5, ValidAPI}, // 4 176 {"SecKeychainItemFreeAttributesAndData", 1, InvalidIdx, ValidAPI}, // 5 177 {"free", 0, InvalidIdx, ErrorAPI}, // 6 178 {"CFStringCreateWithBytesNoCopy", 1, InvalidIdx, PossibleAPI}, // 7 179}; 180 181unsigned MacOSKeychainAPIChecker::getTrackedFunctionIndex(StringRef Name, 182 bool IsAllocator) { 183 for (unsigned I = 0; I < FunctionsToTrackSize; ++I) { 184 ADFunctionInfo FI = FunctionsToTrack[I]; 185 if (FI.Name != Name) 186 continue; 187 // Make sure the function is of the right type (allocator vs deallocator). 188 if (IsAllocator && (FI.DeallocatorIdx == InvalidIdx)) 189 return InvalidIdx; 190 if (!IsAllocator && (FI.DeallocatorIdx != InvalidIdx)) 191 return InvalidIdx; 192 193 return I; 194 } 195 // The function is not tracked. 196 return InvalidIdx; 197} 198 199static SymbolRef getSymbolForRegion(CheckerContext &C, 200 const MemRegion *R) { 201 // Implicit casts (ex: void* -> char*) can turn Symbolic region into element 202 // region, if that is the case, get the underlining region. 203 R = R->StripCasts(); 204 if (!isa<SymbolicRegion>(R)) { 205 return 0; 206 } 207 return cast<SymbolicRegion>(R)->getSymbol(); 208} 209 210static bool isBadDeallocationArgument(const MemRegion *Arg) { 211 if (isa<AllocaRegion>(Arg) || 212 isa<BlockDataRegion>(Arg) || 213 isa<TypedRegion>(Arg)) { 214 return true; 215 } 216 return false; 217} 218/// Given the address expression, retrieve the value it's pointing to. Assume 219/// that value is itself an address, and return the corresponding symbol. 220static SymbolRef getAsPointeeSymbol(const Expr *Expr, 221 CheckerContext &C) { 222 const ProgramState *State = C.getState(); 223 SVal ArgV = State->getSVal(Expr); 224 225 if (const loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(&ArgV)) { 226 StoreManager& SM = C.getStoreManager(); 227 const MemRegion *V = SM.Retrieve(State->getStore(), *X).getAsRegion(); 228 if (V) 229 return getSymbolForRegion(C, V); 230 } 231 return 0; 232} 233 234// When checking for error code, we need to consider the following cases: 235// 1) noErr / [0] 236// 2) someErr / [1, inf] 237// 3) unknown 238// If noError, returns true iff (1). 239// If !noError, returns true iff (2). 240bool MacOSKeychainAPIChecker::definitelyReturnedError(SymbolRef RetSym, 241 const ProgramState *State, 242 SValBuilder &Builder, 243 bool noError) const { 244 DefinedOrUnknownSVal NoErrVal = Builder.makeIntVal(NoErr, 245 Builder.getSymbolManager().getType(RetSym)); 246 DefinedOrUnknownSVal NoErr = Builder.evalEQ(State, NoErrVal, 247 nonloc::SymbolVal(RetSym)); 248 const ProgramState *ErrState = State->assume(NoErr, noError); 249 if (ErrState == State) { 250 return true; 251 } 252 253 return false; 254} 255 256// Report deallocator mismatch. Remove the region from tracking - reporting a 257// missing free error after this one is redundant. 258void MacOSKeychainAPIChecker:: 259 generateDeallocatorMismatchReport(const AllocationPair &AP, 260 const Expr *ArgExpr, 261 CheckerContext &C) const { 262 const ProgramState *State = C.getState(); 263 State = State->remove<AllocatedData>(AP.first); 264 ExplodedNode *N = C.addTransition(State); 265 266 if (!N) 267 return; 268 initBugType(); 269 llvm::SmallString<80> sbuf; 270 llvm::raw_svector_ostream os(sbuf); 271 unsigned int PDeallocIdx = 272 FunctionsToTrack[AP.second->AllocatorIdx].DeallocatorIdx; 273 274 os << "Deallocator doesn't match the allocator: '" 275 << FunctionsToTrack[PDeallocIdx].Name << "' should be used."; 276 BugReport *Report = new BugReport(*BT, os.str(), N); 277 Report->addVisitor(new SecKeychainBugVisitor(AP.first)); 278 Report->addRange(ArgExpr->getSourceRange()); 279 C.EmitReport(Report); 280} 281 282void MacOSKeychainAPIChecker::checkPreStmt(const CallExpr *CE, 283 CheckerContext &C) const { 284 unsigned idx = InvalidIdx; 285 const ProgramState *State = C.getState(); 286 287 StringRef funName = C.getCalleeName(CE); 288 if (funName.empty()) 289 return; 290 291 // If it is a call to an allocator function, it could be a double allocation. 292 idx = getTrackedFunctionIndex(funName, true); 293 if (idx != InvalidIdx) { 294 const Expr *ArgExpr = CE->getArg(FunctionsToTrack[idx].Param); 295 if (SymbolRef V = getAsPointeeSymbol(ArgExpr, C)) 296 if (const AllocationState *AS = State->get<AllocatedData>(V)) { 297 if (!definitelyReturnedError(AS->Region, State, C.getSValBuilder())) { 298 // Remove the value from the state. The new symbol will be added for 299 // tracking when the second allocator is processed in checkPostStmt(). 300 State = State->remove<AllocatedData>(V); 301 ExplodedNode *N = C.addTransition(State); 302 if (!N) 303 return; 304 initBugType(); 305 llvm::SmallString<128> sbuf; 306 llvm::raw_svector_ostream os(sbuf); 307 unsigned int DIdx = FunctionsToTrack[AS->AllocatorIdx].DeallocatorIdx; 308 os << "Allocated data should be released before another call to " 309 << "the allocator: missing a call to '" 310 << FunctionsToTrack[DIdx].Name 311 << "'."; 312 BugReport *Report = new BugReport(*BT, os.str(), N); 313 Report->addVisitor(new SecKeychainBugVisitor(V)); 314 Report->addRange(ArgExpr->getSourceRange()); 315 C.EmitReport(Report); 316 } 317 } 318 return; 319 } 320 321 // Is it a call to one of deallocator functions? 322 idx = getTrackedFunctionIndex(funName, false); 323 if (idx == InvalidIdx) 324 return; 325 326 // Check the argument to the deallocator. 327 const Expr *ArgExpr = CE->getArg(FunctionsToTrack[idx].Param); 328 SVal ArgSVal = State->getSVal(ArgExpr); 329 330 // Undef is reported by another checker. 331 if (ArgSVal.isUndef()) 332 return; 333 334 const MemRegion *Arg = ArgSVal.getAsRegion(); 335 if (!Arg) 336 return; 337 338 SymbolRef ArgSM = getSymbolForRegion(C, Arg); 339 bool RegionArgIsBad = ArgSM ? false : isBadDeallocationArgument(Arg); 340 // If the argument is coming from the heap, globals, or unknown, do not 341 // report it. 342 if (!ArgSM && !RegionArgIsBad) 343 return; 344 345 // Is the argument to the call being tracked? 346 const AllocationState *AS = State->get<AllocatedData>(ArgSM); 347 if (!AS && FunctionsToTrack[idx].Kind != ValidAPI) { 348 return; 349 } 350 // If trying to free data which has not been allocated yet, report as a bug. 351 // TODO: We might want a more precise diagnostic for double free 352 // (that would involve tracking all the freed symbols in the checker state). 353 if (!AS || RegionArgIsBad) { 354 // It is possible that this is a false positive - the argument might 355 // have entered as an enclosing function parameter. 356 if (isEnclosingFunctionParam(ArgExpr)) 357 return; 358 359 ExplodedNode *N = C.addTransition(State); 360 if (!N) 361 return; 362 initBugType(); 363 BugReport *Report = new BugReport(*BT, 364 "Trying to free data which has not been allocated.", N); 365 Report->addRange(ArgExpr->getSourceRange()); 366 C.EmitReport(Report); 367 return; 368 } 369 370 // Process functions which might deallocate. 371 if (FunctionsToTrack[idx].Kind == PossibleAPI) { 372 373 if (funName == "CFStringCreateWithBytesNoCopy") { 374 const Expr *DeallocatorExpr = CE->getArg(5)->IgnoreParenCasts(); 375 // NULL ~ default deallocator, so warn. 376 if (DeallocatorExpr->isNullPointerConstant(C.getASTContext(), 377 Expr::NPC_ValueDependentIsNotNull)) { 378 const AllocationPair AP = std::make_pair(ArgSM, AS); 379 generateDeallocatorMismatchReport(AP, ArgExpr, C); 380 return; 381 } 382 // One of the default allocators, so warn. 383 if (const DeclRefExpr *DE = dyn_cast<DeclRefExpr>(DeallocatorExpr)) { 384 StringRef DeallocatorName = DE->getFoundDecl()->getName(); 385 if (DeallocatorName == "kCFAllocatorDefault" || 386 DeallocatorName == "kCFAllocatorSystemDefault" || 387 DeallocatorName == "kCFAllocatorMalloc") { 388 const AllocationPair AP = std::make_pair(ArgSM, AS); 389 generateDeallocatorMismatchReport(AP, ArgExpr, C); 390 return; 391 } 392 // If kCFAllocatorNull, which does not deallocate, we still have to 393 // find the deallocator. Otherwise, assume that the user had written a 394 // custom deallocator which does the right thing. 395 if (DE->getFoundDecl()->getName() != "kCFAllocatorNull") { 396 State = State->remove<AllocatedData>(ArgSM); 397 C.addTransition(State); 398 return; 399 } 400 } 401 } 402 return; 403 } 404 405 // The call is deallocating a value we previously allocated, so remove it 406 // from the next state. 407 State = State->remove<AllocatedData>(ArgSM); 408 409 // Check if the proper deallocator is used. 410 unsigned int PDeallocIdx = FunctionsToTrack[AS->AllocatorIdx].DeallocatorIdx; 411 if (PDeallocIdx != idx || (FunctionsToTrack[idx].Kind == ErrorAPI)) { 412 const AllocationPair AP = std::make_pair(ArgSM, AS); 413 generateDeallocatorMismatchReport(AP, ArgExpr, C); 414 return; 415 } 416 417 // If the return status is undefined or is error, report a bad call to free. 418 if (!definitelyDidnotReturnError(AS->Region, State, C.getSValBuilder())) { 419 ExplodedNode *N = C.addTransition(State); 420 if (!N) 421 return; 422 initBugType(); 423 BugReport *Report = new BugReport(*BT, 424 "Call to free data when error was returned during allocation.", N); 425 Report->addVisitor(new SecKeychainBugVisitor(ArgSM)); 426 Report->addRange(ArgExpr->getSourceRange()); 427 C.EmitReport(Report); 428 return; 429 } 430 431 C.addTransition(State); 432} 433 434void MacOSKeychainAPIChecker::checkPostStmt(const CallExpr *CE, 435 CheckerContext &C) const { 436 const ProgramState *State = C.getState(); 437 StringRef funName = C.getCalleeName(CE); 438 439 // If a value has been allocated, add it to the set for tracking. 440 unsigned idx = getTrackedFunctionIndex(funName, true); 441 if (idx == InvalidIdx) 442 return; 443 444 const Expr *ArgExpr = CE->getArg(FunctionsToTrack[idx].Param); 445 // If the argument entered as an enclosing function parameter, skip it to 446 // avoid false positives. 447 if (isEnclosingFunctionParam(ArgExpr)) 448 return; 449 450 if (SymbolRef V = getAsPointeeSymbol(ArgExpr, C)) { 451 // If the argument points to something that's not a symbolic region, it 452 // can be: 453 // - unknown (cannot reason about it) 454 // - undefined (already reported by other checker) 455 // - constant (null - should not be tracked, 456 // other constant will generate a compiler warning) 457 // - goto (should be reported by other checker) 458 459 // The call return value symbol should stay alive for as long as the 460 // allocated value symbol, since our diagnostics depend on the value 461 // returned by the call. Ex: Data should only be freed if noErr was 462 // returned during allocation.) 463 SymbolRef RetStatusSymbol = State->getSVal(CE).getAsSymbol(); 464 C.getSymbolManager().addSymbolDependency(V, RetStatusSymbol); 465 466 // Track the allocated value in the checker state. 467 State = State->set<AllocatedData>(V, AllocationState(ArgExpr, idx, 468 RetStatusSymbol)); 469 assert(State); 470 C.addTransition(State); 471 } 472} 473 474void MacOSKeychainAPIChecker::checkPreStmt(const ReturnStmt *S, 475 CheckerContext &C) const { 476 const Expr *retExpr = S->getRetValue(); 477 if (!retExpr) 478 return; 479 480 // Check if the value is escaping through the return. 481 const ProgramState *state = C.getState(); 482 const MemRegion *V = state->getSVal(retExpr).getAsRegion(); 483 if (!V) 484 return; 485 state = state->remove<AllocatedData>(getSymbolForRegion(C, V)); 486 487 // Proceed from the new state. 488 C.addTransition(state); 489} 490 491BugReport *MacOSKeychainAPIChecker:: 492 generateAllocatedDataNotReleasedReport(const AllocationPair &AP, 493 ExplodedNode *N) const { 494 const ADFunctionInfo &FI = FunctionsToTrack[AP.second->AllocatorIdx]; 495 initBugType(); 496 llvm::SmallString<70> sbuf; 497 llvm::raw_svector_ostream os(sbuf); 498 499 os << "Allocated data is not released: missing a call to '" 500 << FunctionsToTrack[FI.DeallocatorIdx].Name << "'."; 501 BugReport *Report = new BugReport(*BT, os.str(), N); 502 Report->addVisitor(new SecKeychainBugVisitor(AP.first)); 503 Report->addRange(SourceRange()); 504 return Report; 505} 506 507void MacOSKeychainAPIChecker::checkDeadSymbols(SymbolReaper &SR, 508 CheckerContext &C) const { 509 const ProgramState *State = C.getState(); 510 AllocatedSetTy ASet = State->get<AllocatedData>(); 511 if (ASet.isEmpty()) 512 return; 513 514 bool Changed = false; 515 AllocationPairVec Errors; 516 for (AllocatedSetTy::iterator I = ASet.begin(), E = ASet.end(); I != E; ++I) { 517 if (SR.isLive(I->first)) 518 continue; 519 520 Changed = true; 521 State = State->remove<AllocatedData>(I->first); 522 // If the allocated symbol is null or if the allocation call might have 523 // returned an error, do not report. 524 if (State->getSymVal(I->first) || 525 definitelyReturnedError(I->second.Region, State, C.getSValBuilder())) 526 continue; 527 Errors.push_back(std::make_pair(I->first, &I->second)); 528 } 529 if (!Changed) 530 return; 531 532 // Generate the new, cleaned up state. 533 ExplodedNode *N = C.addTransition(State); 534 if (!N) 535 return; 536 537 // Generate the error reports. 538 for (AllocationPairVec::iterator I = Errors.begin(), E = Errors.end(); 539 I != E; ++I) { 540 C.EmitReport(generateAllocatedDataNotReleasedReport(*I, N)); 541 } 542} 543 544// TODO: Remove this after we ensure that checkDeadSymbols are always called. 545void MacOSKeychainAPIChecker::checkEndPath(CheckerContext &Ctx) const { 546 const ProgramState *state = Ctx.getState(); 547 AllocatedSetTy AS = state->get<AllocatedData>(); 548 if (AS.isEmpty()) 549 return; 550 551 // Anything which has been allocated but not freed (nor escaped) will be 552 // found here, so report it. 553 bool Changed = false; 554 AllocationPairVec Errors; 555 for (AllocatedSetTy::iterator I = AS.begin(), E = AS.end(); I != E; ++I ) { 556 Changed = true; 557 state = state->remove<AllocatedData>(I->first); 558 // If the allocated symbol is null or if error code was returned at 559 // allocation, do not report. 560 if (state->getSymVal(I.getKey()) || 561 definitelyReturnedError(I->second.Region, state, 562 Ctx.getSValBuilder())) { 563 continue; 564 } 565 Errors.push_back(std::make_pair(I->first, &I->second)); 566 } 567 568 // If no change, do not generate a new state. 569 if (!Changed) 570 return; 571 572 ExplodedNode *N = Ctx.addTransition(state); 573 if (!N) 574 return; 575 576 // Generate the error reports. 577 for (AllocationPairVec::iterator I = Errors.begin(), E = Errors.end(); 578 I != E; ++I) { 579 Ctx.EmitReport(generateAllocatedDataNotReleasedReport(*I, N)); 580 } 581} 582 583 584PathDiagnosticPiece *MacOSKeychainAPIChecker::SecKeychainBugVisitor::VisitNode( 585 const ExplodedNode *N, 586 const ExplodedNode *PrevN, 587 BugReporterContext &BRC, 588 BugReport &BR) { 589 const AllocationState *AS = N->getState()->get<AllocatedData>(Sym); 590 if (!AS) 591 return 0; 592 const AllocationState *ASPrev = PrevN->getState()->get<AllocatedData>(Sym); 593 if (ASPrev) 594 return 0; 595 596 // (!ASPrev && AS) ~ We started tracking symbol in node N, it must be the 597 // allocation site. 598 const CallExpr *CE = cast<CallExpr>(cast<StmtPoint>(N->getLocation()) 599 .getStmt()); 600 const FunctionDecl *funDecl = CE->getDirectCallee(); 601 assert(funDecl && "We do not support indirect function calls as of now."); 602 StringRef funName = funDecl->getName(); 603 604 // Get the expression of the corresponding argument. 605 unsigned Idx = getTrackedFunctionIndex(funName, true); 606 assert(Idx != InvalidIdx && "This should be a call to an allocator."); 607 const Expr *ArgExpr = CE->getArg(FunctionsToTrack[Idx].Param); 608 PathDiagnosticLocation Pos(ArgExpr, BRC.getSourceManager(), 609 N->getLocationContext()); 610 return new PathDiagnosticEventPiece(Pos, "Data is allocated here."); 611} 612 613void ento::registerMacOSKeychainAPIChecker(CheckerManager &mgr) { 614 mgr.registerChecker<MacOSKeychainAPIChecker>(); 615} 616